Alloy Mix and Woodgrain Errors

What this classification means

Improperly blended alloy can create streaked coloration or structural differences in a genuine planchet. A useful identification does more than name an unusual shape. It explains when in production the feature formed, what physical evidence should remain, and which ordinary forms of damage can imitate it.

Diagnostic evidence to record

Compare luster continuity, streak direction, composition, known alloy behavior, and whether the pattern is integral to the metal.

Repeatable method: start with Error or damage?, then use the identification workflow and value guide. The page below should add evidence specific to this error class, variety, coin, or damage lookalike.
• Compare with certified examples and mint-production references, not viral price claims.

Common lookalikes and failure points

Toning, fingerprints, environmental staining, cleaning, and copper plating variation can create similar stripes.

A practical examination sequence

1. Confirm the host coin. Identify denomination, design subtype, date, mint, composition, and expected weight.
2. Describe before naming. Write what the metal actually does without using a marketplace label.

Value factors